Datasheet

MSP430F5438, MSP430F5437, MSP430F5436, MSP430F5435
MSP430F5419, MSP430F5418
SLAS612D –AUGUST 2009–REVISED AUGUST 2013 www.ti.com
12-Bit ADC, Power Supply and Input Range Conditions
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
AV
CC
and DV
CC
are connected together,
AV
CC
Analog supply voltage AV
SS
and DV
SS
are connected together, 2.2 3.6 V
V
(AVSS)
= V
(DVSS)
= 0 V
All ADC12 pins: P6.0 to P6.7, P7.4 to P7.7,
V
(Ax)
Analog input voltage range
(2)
0 AV
CC
V
P5.0, and P5.1 terminals
f
ADC12CLK
= 5.0 MHz, ADC12ON = 1, 2.2 V 125 155
Operating supply current into
I
ADC12_A
REFON = 0, SHT0 = 0, SHT1 = 0, µA
AV
CC
terminal
(3)
3 V 150 220
ADC12DIV = 0
ADC12ON = 0,
3 V 150 190
REFON = 1, REF2_5V = 1
Operating supply current into
I
REF+
µA
AV
CC
terminal
(4)
ADC12ON = 0,
2.2 V, 3 V 150 180
REFON = 1, REF2_5V = 0
Only one terminal Ax can be selected at one
C
I
Input capacitance 2.2 V 20 25 pF
time
R
I
Input MUX ON resistance 0 V ≤ V
Ax
≤ AV
CC
10 200 1900 Ω
(1) The leakage current is specified by the digital I/O input leakage.
(2) The analog input voltage range must be within the selected reference voltage range V
R+
to V
R–
for valid conversion results. If the
reference voltage is supplied by an external source or if the internal reference voltage is used and REFOUT = 1, then decoupling
capacitors are required. See 12-Bit ADC, External Reference and 12-Bit ADC, Built-In Reference.
(3) The internal reference supply current is not included in current consumption parameter I
ADC12
.
(4) The internal reference current is supplied via terminal AV
CC
. Consumption is independent of the ADC12ON control bit, unless a
conversion is active. The REFON bit enables to settle the built-in reference before starting an A/D conversion. No external load.
12-Bit ADC, External Reference
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
V
eREF+
Positive external reference voltage input V
eREF+
> V
REF–
/V
eREF–
(2)
1.4 AV
CC
V
V
REF–
/V
eREF–
Negative external reference voltage input V
eREF+
> V
REF–
/V
eREF–
(3)
0 1.2 V
(V
eREF+
– Differential external reference voltage
V
eREF+
> V
REF–
/V
eREF–
(4)
1.4 AV
CC
V
V
REF–
/V
eREF–
) input
I
VeREF+
Static input current 0 V ≤ V
eREF+
≤ V
AVCC
2.2 V, 3 V ±1 µA
I
VREF–/VeREF–
Static input current 0 V ≤ V
eREF–
≤ V
AVCC
2.2 V, 3 V ±1 µA
C
VREF+/-
Capacitance at VREF+ or VREF- terminal
(5)
10 µF
(1) The external reference is used during conversion to charge and discharge the capacitance array. The input capacitance, C
i
, is also the
dynamic load for an external reference during conversion. The dynamic impedance of the reference supply should follow the
recommendations on analog-source impedance to allow the charge to settle for 12-bit accuracy.
(2) The accuracy limits the minimum positive external reference voltage. Lower reference voltage levels may be applied with reduced
accuracy requirements.
(3) The accuracy limits the maximum negative external reference voltage. Higher reference voltage levels may be applied with reduced
accuracy requirements.
(4) The accuracy limits minimum external differential reference voltage. Lower differential reference voltage levels may be applied with
reduced accuracy requirements.
(5) Two decoupling capacitors, 10µF and 100nF, should be connected to VREF to decouple the dynamic current required for an external
reference source if it is used for the ADC12_A. See also the MSP430x5xx and MSP430x6xx Family User's Guide (SLAU208).
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